treeview 保持选中状态
发现当treeview控件失去焦点的时候,会丢失选中状态的指示(条目的蓝色背景)。如果想要保持,只要设置treeview的一个属性即可:
this.treeView1.HideSelection = false;
但是,发现阴影很浅,但是聊胜于无。
在博客园上找到了“大气象学习园地”的一篇博文(链接),刚好说到这个事,他通过重写DrawMode()来控制选中节点颜色,把他的代码也贴上:
public FrmMain() { InitializeComponent(); treeView1.HideSelection = False; //自已绘制 this.treeView1.DrawMode = TreeViewDrawMode.OwnerDrawText; this.treeView1.DrawNode += new DrawTreeNodeEventHandler(treeView1_DrawNode); } //在绘制节点事件中,按自已想的绘制 private void treeView1_DrawNode(object sender, DrawTreeNodeEventArgs e) { e.DrawDefault = true; //我这里用默认颜色即可,只需要在TreeView失去焦点时选中节点仍然突显 return; if ((e.State & TreeNodeStates.Selected) != 0) { //演示为绿底白字 e.Graphics.FillRectangle(Brushes.DarkBlue, e.Node.Bounds); Font nodeFont = e.Node.NodeFont; if (nodeFont == null) nodeFont = ((TreeView)sender).Font; e.Graphics.DrawString(e.Node.Text, nodeFont, Brushes.White,Rectangle.Inflate(e.Bounds, 2, 0)); } else { e.DrawDefault = true; } if ((e.State & TreeNodeStates.Focused) != 0) { using (Pen focusPen = new Pen(Color.Black)) { focusPen.DashStyle = System.Drawing.Drawing2D.DashStyle.Dot; Rectangle focusBounds = e.Node.Bounds; focusBounds.Size = new Size(focusBounds.Width - 1, focusBounds.Height - 1); e.Graphics.DrawRectangle(focusPen, focusBounds); } } }